If you are set on adding a scope to your rifle, my suggestion is to take it to a reputable gunsmith, have it drilled and tapped for a mount and have the bolt bent so that it clears the scope. All of this will be relatively inexpensive.
IMO, the Mosin Nagant represents one of the best values for a hunting rifle that's out there today. They are extremely rugged as well as utlilitarian and worth the few extra bucks you'll need to invest.
BTW.. I've got over a dozen of these rifles including the sniper version. they are all great performers.